Mike Machak, a prison spokesman, said in a statement Monday that all inmates were secured in their housing units by 2:45 a.m. Monday, nearly 12 hours after the disturbance began at the Adams County Correctional Center in southwest Mississippi.

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Officials haven’t released the identity of the slain guard. Machak said 16 other employees were treated and released from a hospital for various injuries. Three inmates were injured. The prison is owned and operated by Corrections Corp. of America and holds illegal immigrants, most for charges of re-entering the United States after being deported.